KRCY 4-Step Rock Tumbling Grit Kit

The KRCY 4-Step Rock Tumbling Grit Kit is a complete professional-grade abrasive system designed for rotary rock tumbling from rough stones to mirror-polished gemstones.

This system follows the standard lapidary tumbling process used by hobbyists, educators, and professional lapidary workshops worldwide. Each stage is engineered to progressively refine stone surfaces, ensuring consistent shaping, smoothing, and polishing results.

Stage Breakdown

Stage 1 – Coarse Grinding (Silicon Carbide)
Removes rough surfaces, sharp edges, fractures, and irregular shapes from raw stones. This is the most aggressive stage and defines the final shape of the stone.

Stage 2 – Medium Grinding (Silicon Carbide)
Smooths scratches left by coarse grinding and refines the stone surface for further polishing stages.

Stage 3 – Pre-Polish (Fine Abrasive)
Removes micro-scratches and prepares stones for final polishing, ensuring high clarity and surface uniformity.

Stage 4 – Final Polish (Polishing Compound)
Produces a bright, reflective, mirror-like finish and enhances color depth and clarity.

Compatible Materials

• Agate
• Jasper
• Quartz
• Obsidian
• Aventurine
• Petrified wood
• Tiger eye
• Fluorite
• Sodalite

Compatible Tumblers

• Rotary rock tumblers (3LB / 6LB / 12LB)
• KRCY tumblers
• Lortone
• Thumler’s
• Tumble-Bee systems

Usage Tips

• Always clean barrel between stages
• Never mix different grit stages
• Maintain correct slurry consistency
• Inspect stones before advancing stages
• Use proper barrel fill ratio (2/3–3/4 full)

Applications

• Hobby rock tumbling
• STEM education
• Geological learning
• Lapidary workshops
• DIY gemstone polishing projects

KRCY grit kits are designed for consistent performance, reduced contamination between stages, and reliable polishing results for both beginners and advanced users.